The signs a property is being used as a cannabis farm
Summary
Zurich UK reports a sharp rise in suspected or identified cannabis farm incidents attended by fire and rescue services, with a record level reached in 2024 and a slight fall in 2025. The article highlights that cultivation is increasingly taking place in rented and vacant properties, with common warning signs including tampered electrics, ventilation alterations, condensation, odours and high humidity.
Why it matters
Residential surveyors may encounter indicators of illegal cultivation during inspections, valuations or pre-acquisition surveys, particularly in vacant or tenanted properties. The associated electrical tampering, moisture damage and repair costs can create significant safety, defect and insurance implications.
Key points
- Suspected or identified cannabis farm incidents attended by fire and rescue services rose sharply over the period cited.
- Zurich UK says claims linked to cannabis farms have totalled £9.4 million since January 2022.
- Organised criminal groups are increasingly using rented properties and vacant premises, including high street units.
- Warning signs include external ducting, blacked-out windows, unusual odours, condensation, altered electrics and high humidity.
- Landlords are advised to carry out robust due diligence and regular inspections.
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